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  1. Did you tried to call : sudo echo 0 > /sys/class/pwm/pwmchip1/export Before calling pwmset / pwmsts? EDIT : Ok, I've forgotten about permissions and initialization - on my system it's called once after power up, so there's no need for it on pwmset/pwmsts I've added to repo new file : call it with root priviliges or add it to execution on startup.
  2. I've created the repository on github with all required files, including 2 scripts I'm using to control and query PWM FAN speed. Hope You'll find it usefull. EDIT : Also, to control fan speed based on HDD temperature you can use smartctl tool to read HDD temperature from SMART. Example output for my NVMe : sudo smartctl -a /dev/nvme0 | grep Temperature Temperature: 76 Celsius Warning Comp. Temperature Time: 0 Critical Comp. Temperature Time: 0 Temperature Sensor 2:
  3. Yhea, that makes two of us It took me some time and digging before I figured out the correct naming convention
  4. Hi, no I haven't. The previous configuration is still working, so no need to update to new images. The overlay should be compiled via dtc to file rockchip-pwm-gpio.dtbo, and put in location : /boot/dtb/rockchip/overlay/ The activation in /boot/armbianEnv.txt should be via overlays variable : overlay_prefix=rockchip overlays=pwm-gpio Hope this helps. Best regards
  5. ok, I've managed to sort this out on my own. I've decompiled the rockchip-rockpi4.dtb and find out that pwm is disabled by default. So I've wrote new overlay for pwm, just to enable it : /dts-v1/; / { compatible = "rockchip,rk3399"; fragment@0 { target-path = "/aliases"; __overlay__ { pwm0 = "/pwm@ff420000"; pwm1 = "/pwm@ff420010"; }; }; fragment@1 { target-path = "/pwm@ff420000"; __overlay__ { s
  6. Hi, I'm new to armbian and I've started with RockPi4b board. I would like to add fan control with PWM, but adding pwm (or pwm0) overlay doesn't work. I can't also find the overlay for it at /boot/dtb-5.8.6-rockchip64/rockchip/overlay/. Is it supported? I've checked and the /sys/class/pwm/pwmchip0 is present, but accessing export, as described here : doesn't work and /sys/class/pwm/pwmchip0/pwm0 is not present. I've tried to find pwm access examples for this board, but none of it works on armbian (all are vendor builds specific). Can anybody point m